Grinding machine



March 22, 1932. c, BOOTH 1,850,373

GRINDING MACHINE Filed Sept. 27. 1929 2 Sheets-Sheet 1 March-22, 1932. c. BOOTH GRINDING MACHINE Filed Sept. 27. 1929 2 Sheets-Sheet 2 7 6 I gnaw Mow Patented Mar. 22, 1932 UNITED STATES PATENT o FicE Y emiumirnoorn, or cmcmmi'rr, 01110, AssiGNoR T CINCINNATI GRINDERS moon- PORATED, OF CINCINNATI, OHIO, A CORPORATION OF OHIO I GRINDING MACHINE Application .filed September 27 1929. Serial No. 395,708.

This invention relates to improvements in centerless, grinding machinery and has par-' ticular reference to an. automatic feed mccli-,

anisni for use in conjunction therewith.

One of the-principal objects of theprescnt invention is the provision of 'a feed mechanism.

particularly adapted for use in connection with a through food centcrless grinder, which will serve to, insure supply of a continuouspie'ces'to the grinding throat of the machine.

series of work A further object of the invention is the pro vision of a low positioned hopper which may be readily filled either by dumping. of a truck or container of work pieces therei nt-oor which may be positioned to receivedischarged work i from the adjacent machine of a battery and which will satisfactorily move. work pieces for satisfactorily engagiiigloose ivork pieces for presentation in systematic aligned position and for properly caring for excess work pieces to prevent jamming thereof in the throat of the machine.

' Further objects and advantages consist in a simplification of parts and improvement in structural details, and should be readily zip parent by reference to the following speci fleation,considered :in conjunction with the accompanying drawings. but it will be understood that we may make anyniodifications in the specific structural details hereinafter disclosed, within the scope of the appended claims, without departing from or exceeding the spirit of the invention.

' Figure i is a front-elevation of the invention.

to illustrate the position of thc work pieces in the grinding throat and with respect to the selector.

the line of Figure 1.

Figure 2 is a semi-diagrammatic end \'l(-W of the parts, with the grind ing wheel i-ei'nored Figure 4 is a perspective view of one of the work engaging studs.

Figure 5 is an enlarged vertical section as on the line 5-5 of Figure 2.

. Figure 6 is a section as on the line 66 of Figure 5.

Figure 7 is a fragmentary section through the hopper with the work retaining members and guide chute shown'in elevation, and

Figure 8 is a transverse section as on the line 8-8 of Figures 2 and 7.

In the drawings, the numeral 10 designates the bed of a center-less grinder supporting thereon the grinding wheel 11 and slide 12 for the regulating wheel 13, said wheels being disposed .in o1 i'position one to theother to provide'agriiidiiig throat therebetwceu and the regulating wheel being preferably tilted at an angle to produce a feed component axially urging work pieces 14 through the throat along the work rest blade 15. Machines of this type are employed for what is known as through feed grinding, in which it is intended to maintain a continuous stream o t work pieces successively presented to and passing throughthe grinding throat for simultaneous grinding, asis indicated in connection with Figure 2. While this feeding of the work can be manually effected by an operator, the same is fatiguing. I have therefore provided an improved mechanisinfor automatic presentation of the work pieces. This mech-- anism includes a bracket 16 secured to the bed 10 and having journaled therein a shaft 17 hearing a worni'18. This worm is. suitably driven 'as by gear 19 connecting with the drive mechanism in the bed of the :machine, by an independent motor or otherwise, as preferred.

Meshing with worm 18 is a worm gear 20 on'- spindle 21 hearing the slowly rotating disc 22 disposed in the hopper or container 23 supported by bracket 16. This disc is provided on its upper or exposed face witha series of studs having headsj23a preferably under-cut as at 24. and flattened or beveled at one side as at 25, to provide the work engaging points or corners 26.

When a number of .voi-k pieces l4 are placed in the hopper 27, they will pile up in a jumbled condition andin varying relation and it is to be noted that the disc 22 is disposed at an angle and forms in effect the lower wall'or bottom for the hopper, its lower side 28 being tilted downward or inclined in the direction of the disc 22 so that the work pieces are urged by gravity thereagainst. As the disc is rotated, the several studs will bear against the work pieces and in the event that the adjacent work pieces are laying with their axes parallel, or substantially so, to the face of the disc, individual work pieces will drop, as indicated in Figure 2, into the spaces, as at 29, between adjacent pins. The corner 26 will en age with the work piece, which is particular y advantageous when the feed mechanism is utilized for piston pins or like hollow articles, as the pointed portion of the stud will then hook around the wall of the work piece, insuring more firm engagement therewith. Continued rotation of the disc will carry the work pieces circumferentially upward into engagement with resilient guide fin er 30 positioned to allow an individual work piece to pass thereunder and tending to hold the same against the disc in its upward movement while kicking back into the hopper other piled up work pieces and forming,-in effect, a separator. As the work piece is so held, it will move upward into engagement with a second resiliently actuated retaining finger 31 and be forceably pressed past finger 31 into the guide chute 32. At the same time, a trigger member or lever 33, adj acent member 31, frictionally engages rising ment rather than work pieces and tends to snap therebeneath as individual work pieces are pressed thereabove. The combined action of members 30, 31 and 33 is such as to prevent reverse or downward movement of any work pieces entering the lower end of the chute, thus maintaining a continuous column of work pieces in the event that, due to lateral engageterminal, certain of the work-pieces are kicked out of the spaces,29 by the separator member 30. It will be noted the trigger member or lever 33 is so disposed as to project beneath an individual work piece while it is still being raised by its supporting pin or stud 23. j j

The chute 32 extends upward to empty laterally into an open feed trough 34 carried as a part thereof and extending into position to discharge work pieces onto the rest 15. This open upper portion has a flared or funnel-like subtending extension 35 terminating in a return chute 36. In the event that more work pieces are presented into and through chute 32 than can be accommodated by the machine, the excess work pieces will roll off the upper end of trough 34 and be returned to the hopper through chute 36. In this manner a continuous gravity feed head or supply of work pieces is maintained in trough 34, so that a continuous, grinding operation is automatica ly effected by the the curved machine. A second discharge trough 37 is disposed atthe opposite end'of the work rest, for reception of ground work pieces to carry them to the hopper 27 of an adjacent machine. In this manner the work pieces may to machine for performance of successive grindings thereon until the desired stock removal has been effected and proper finish produced.

I claim:

1. A centerless grinder including opposed grinding and regulating wheels forming a grlnding throat, a work rest intermediate the throat, and means for presenting successive work pieces to the throat including a guide be fed in a continuous manner from machine having a discharge portion terminating adj acent the chute, a hopper member, a rotary selector within the hopper and means for guiding selected work pieces from said rotary member into the tube, and means for preventing lateral deflection of the work pieces relative the tube during pressure of the'selector against the terminal portion of the work piece.

3. A centerless grinder including opposed grinding and regulating wheels forming a grinding throat, a work rest intermediate the throat, means for presenting successive work pieces to having a discharge j acent the chute, a hopper member, a rotary selector within the hopper and means for IOU the throat including a guide chute terminatlng adjacent the work rest, a tube portion terminating adguiding selected work pieces from said rotary member into the tube, and means for preventing retrograde movement of work pieces in the tube.

4. A device of the character described including a container, an angularly disposed rotary member forming a lower closuretherefor, said member having studs projecting therefrom providing work receiving spaces, a discharge chute, and means for guiding work pieces when properly positioned in the spaces "into said chute whereby the rotary movement of the studs will effect longitudinal movement of the work into the chute.

. 5. A device of the character described including a container, an angularly disposed rotary member forming a lower closure therefor, said member having studs projecting therefrom provlding work receiving spaces,

of the studs will effect longitudinal move-,

ment of the work into the chute, and spring actuated mechanism for preventing reverse -m0venient of the pieces in the chute.

6. A mechanism of the character described in combination with a hopper, of inlet and discharge chutes communicating therewith, said chutes having adjacent termini coupled by a flared feed-member, a work receiving trough adapted to receive work pieces from the discharge chute and having a portion overlying the flared feed member whereby excess work pieces may drop thereinto and be returned through the inlet chute, and selector meansin the hopper for urging successive work piecesinto the discharge chute.

7. A mechanism of the character described in combination with a hopper, of inlet and discharge chutes communicating therewith, said chutes having adjacent termini coupled by a flared feed member, a work receiving trough adapted to receive work pieces from the discharge chute and having a portion overlying the flared feed member whereby excess work pieces may drop thereinto and be returned through the inlet chute, selector means in the hopper for urging successive work pieces into the discharge chute, and means for preventing return movement of work pieces through the discharge chute.

8.The combination with a centerless grinder includinga grinding wheel driven at a high grinding rate of speed and an opposed work feeding and regulating wheel operable at a slow work controlling rate of speed, of a work rest disposed between said wheels whereby the same may exert a combined grinding and ,axial feeding movement on work pieces supported by the rest, a hopper supported bythe machine, a rotary work feeding member within the hopper, and driving connections between the wheel operating mechanism and feed mechanism for insuring simultaneous actuation thereof.

' '9. In a mechanism of the class described,

the combination of a bracket, a container se-' cured thereto and having one wall extendingat an inclined angle, a rotatable member within the container and extending at an angle to the inclined wall of the container terminating adjacent thereto, whereby WOiIk pieces are actuated by gravity to the point of adjacency of the container side and rotatable member, selector and pusher studs carried by the member and forming spaces between adjacent studs for the work pieces whereby they are carried with the member, a

' guide chute extending from the container tangentto the rotatable member, and means for shunting the work pieces from the member into the guide tube as they are rotated by the member.

10. In a mechanism of the class described, the combination of a bracket, a container secured thereto and having one wall extending at an inclined angle, a rotatable member.

within the container and extending at an angle to the inclined wall of the container terminating adjacent thereto, whereby work pieces are actuated by'gravity to thepoint of adjacency of the container side and rotatable member, selector-and pusher studs carried cured thereto and having one wall extending I at an inclined angle, a rotatable member within the container and extending at an an gle to the inclined wall of the container terminating adjacent thereto, whereby work pieces are actuated by gravity to the point of adjacency of the container side and rotatable member, selector and pusher studs carried by the member and forming spaces between adjacent studs for the work pieces whereby they are carried with the member, a guide chute extending from the container tangent to the rotatable member, means for shunting the work pieces from the member into the guide tube as they are rotated by the member, means carried by the tube at the base thereof for engagement with the work after it is inserted within the tube to preventretrograde movement thereof, a guiding chute at the other terminus of the tube to which the work pieces are delivered by the guide tube, a ret'urn chute adjacent the guiding tube having its lower terminus within the container and its upper terminus adjacent the guide chute, and means for directing an over-flow of work pieces from the guide chute to the return chute.

12. In a device of the class described, the combination of a machine tool having a work support, tools adjacent the work support, feeding means adjacent the work support, a guide chute terminating at one end of the support for guiding work pieces to' the said work support, a feed mechanism for selecting and delivering work pieces to the guide chute, a discharge chute at the other-end of the work support receiving work pieces from the support, and a second work selecting and feeding mechanism receiving work pieces from the work discharge chute, for feeding same to a second machine tool.

In testimony whereof I afiix my signature.

CLEMENT BOOTH. 

